APPLICATION OF WRF/UCM IN THE SIMULATION OF A HEAT WAVE EVENT AND URBAN HEAT ISLAND AROUND GUANGZHOU  

作　　者：蒙伟光 张艳霞 李江南 林文实 戴光丰 李昊睿 

机构地区：[1]Guangzhou Institute of Tropical and Marine Meteorology,CMA [2]State Key Laboratory of Severe Weather,Chinese Academy of Meteorological Sciences [3]School of Environmental Science and Engineering,Sun Yat-sen University

出　　处：《Journal of Tropical Meteorology》2011年第3期257-267,共11页热带气象学报（英文版）

基　　金：Natural Science Foundation of China(40775068);Specialized Projects of Scientific Research for Public Welfare Industry(Meteorology);Open Projects of Key National Laboratories for Disasters-causing Weather(GYHY200706014;GYHY200906026);Science Foundation of China(2009LASW-B03);Foundation for Scientific Research on Tropical and Marine Meteorology

摘　　要：This paper evaluated the performance of a coupled modeling system,Weather Research and Forecasting(WRF)/Urban Canopy Model(UCM),in the simulation of a heat wave event which occurred around Guangzhou during late June through early July,2004.Results from three experiments reveal that the UCM with new land data(hereafter referred to as E-UCM)reproduces the best 2-m temperature evolution and the smallest minimum absolute average error as compared with the other two experiments,the BPA-Bulk Parameterization Approach with new land data(E-BPA)and the UCM with original U.S. Geological Survey land data(E-NOU).The E-UCM is more useful in capturing the temporal and spatial distribution of the nighttime Urban Heat Island(UHI).Differences in surface energy balance between the urban and suburban areas show that low daytime albedo causes more absorption of solar radiation by urban areas.Due to the lack of vegetation which inhibits cooling by evapotranspiration,most of the incoming energy over urban areas is partitioned into sensible heat flux and therefore heats the surface and enhances the heat wave.During nighttime,the energy in the urban area is mainly from soil heat flux.Although some energy is partitioned as outgoing long wave radiation,most of the soil heat flux is partitioned into sensible heat flux due to the small latent heat flux at night.This leads to the development of nighttime UHI and the increase of the magnitude and duration of heat waves within the municipality.This paper evaluated the performance of a coupled modeling system,Weather Research and Forecasting（WRF）/Urban Canopy Model（UCM）,in the simulation of a heat wave event which occurred around Guangzhou during late June through early July,2004.Results from three experiments reveal that the UCM with new land data（hereafter referred to as E-UCM）reproduces the best 2-m temperature evolution and the smallest minimum absolute average error as compared with the other two experiments,the BPA-Bulk Parameterization Approach with new land data（E-BPA）and the UCM with original U.S. Geological Survey land data（E-NOU）.The E-UCM is more useful in capturing the temporal and spatial distribution of the nighttime Urban Heat Island（UHI）.Differences in surface energy balance between the urban and suburban areas show that low daytime albedo causes more absorption of solar radiation by urban areas.Due to the lack of vegetation which inhibits cooling by evapotranspiration,most of the incoming energy over urban areas is partitioned into sensible heat flux and therefore heats the surface and enhances the heat wave.During nighttime,the energy in the urban area is mainly from soil heat flux.Although some energy is partitioned as outgoing long wave radiation,most of the soil heat flux is partitioned into sensible heat flux due to the small latent heat flux at night.This leads to the development of nighttime UHI and the increase of the magnitude and duration of heat waves within the municipality.

关 键 词：heat wave Urban Heat Island（UHI） Urban Canopy Model（UCM） numerical simulation 

分 类 号：P404[天文地球—大气科学及气象学] X16[环境科学与工程—环境科学]